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22--Coverings for Pipes'and Hot, Surfaces IP- H. Heilman. A.S.M.E. Trans. (1929) PI. FSP-51-41-287} Fig. 2. Heat Transmitted by Convection this figure the conductivities are plotted as functions of the mean tem peratures or the mean of the inner and outer surface temperatures of the insulations- 332 [R. H. Heilman. A.S.H.E. Trans. (1929) PI. FSP-51-41-287] Fig. 3. Heat Transmitted by Radiation ' This method of plotting conductivities, enables one readily to calculate. ! :the heat loss through single or compound sections. It should, be empha sized that in this figure, the conductivities given for the various insula-